Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2020, Vol. 17, No. 1, pp. 89-98
Astrometric model of a stellar spacecraft orientation sensor
G.A. Avanesov
1 , E.V. Belinskaya
1 , N.N. Brysin
1 , O.V. Filippova
1 , V.A. Shamis
1 , Ya.D. Elyashev
1 1 Space Research Institute RAS, Moscow, Russia
Accepted: 16.01.2020
DOI: 10.21046/2070-7401-2020-17-1-89-98
The astrometric model of a stellar sensor is developed and used to study and predict the results of the operation of hardware and software and mathematical elements of devices in the process of solving the problem of measuring direction to a single star in the sky. The astrometric model includes: a basic catalog of stars, a photometric model of the instrument, programs for localizing stars on a photodetector array, as well as an apparatus for statistical analysis and generalization of the results of measurements of their coordinates. The model allows us to a priori estimate the expected random and systematic errors in measuring the direction of stars of different brightness and spectral classes, taking into account the features of their environment and the parameters of specific instruments, including under conditions of exposure to noise of various physical nature. A priori knowledge of the response of the instrument to the appearance of stars in different environments with different noise levels and external illumination allows us to optimize on-board star catalogs, star localization programs on a photodetector array, and also to solve the problem of reducing the level of random and systematic measurement errors associated with the on-board catalog. The astrometric model of the stellar orientation sensor is implemented in the Star Manager computer program.
Keywords: star tracker, astrometry, star catalog, point spread function, systematic error, random error, integrated star brightness, centroidal method, photon noise, instrument noise
Full textReferences:
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